216165125 has 16 divisors (see below), whose sum is σ = 294300864. Its totient is φ = 157210000.

The previous prime is 216165097. The next prime is 216165127. The reversal of 216165125 is 521561612.

It is a happy number.

It is not a de Polignac number, because 216165125 - 2²⁰ = 215116549 is a prime.

It is a super-3 number, since 3×216165125³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216165127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77231 + ... + 79980.

It is an arithmetic number, because the mean of its divisors is an integer number (18393804).

Almost surely, 2^216165125 is an apocalyptic number.

216165125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216165125 is a deficient number, since it is larger than the sum of its proper divisors (78135739).

216165125 is a wasteful number, since it uses less digits than its factorization.

216165125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157237 (or 157227 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 216165125 is about 14702.5550500585. Note that the first 3 decimals coincide. The cubic root of 216165125 is about 600.1528545743.

The spelling of 216165125 in words is "two hundred sixteen million, one hundred sixty-five thousand, one hundred twenty-five".